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Share-Based Compensation (Details 4) - USD ($)
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Equity-based compensation    
Fair value of shares vested $ 1,000,000  
Fair market value of options granted (in dollars per share) $ 3.57 $ 2.74
Weighted average assumptions    
Expected life 6 years 1 month 6 years 3 months
Interest rate 1.56% 1.97%
Volatility 103.30% 70.40%
Time-based stock options    
Equity-based compensation    
Total unrecognized compensation cost $ 4,900,000  
Weighted-average period to recognize compensation cost 3 years 15 days  
Performance based options | Equity awards for non-employees issued for services    
Equity-based compensation    
Total unrecognized compensation cost $ 0